unity 按下按钮实现UI显示与隐藏

void Update()
    {
        if(Input.GetKeyUp(KeyCode.D))
        {
            flag = !flag;
        }
        if (flag)
        {
            open_txt_btn.GetComponent<CanvasGroup>().alpha = 1;
        }
        else
        {
            open_txt_btn.GetComponent<CanvasGroup>().alpha = 0;
        }
}

 

给UI组件加Canvas Group，Alpha为1显示，为0隐藏